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Cold sintered temperature stable xLi2MoO4-(1-x)(LiBi)0.5MoO4 microwave dielectric ceramics

Xiaomeng Li,Xian Xue,Qiyin Lin,Zeming Qi,Hong Wang,Yingying Zhao,Jing Guo

Temperature stable xLi 2 MoO 4 -(1-x)(LiBi) 0.5 MoO 4 (x = 0, 40, 50, 60, 70, 100 vol%) microwave dielectric ceramics obtained by cold sintering process (CSP) under a mild sintering condition (120 ℃/30 min/200 MPa) are introduced in this work. The XRD , SEM, and Raman analysis indicate the coexistence of Li 2 MoO 4 and (LiBi) 0.5 MoO 4 phases. Li 2 MoO 4 -(LiBi) 0.5 MoO 4 ceramics are compatible with Ag and Al electrode materials under cold sintering condition. The specimens exhibit high relative densities and good microwave dielectric properties (relative permittivities: 31.5–5.5; Q×f values: 1900 - 18,500 GHz; TCF values: from +144 ppm/℃ to −106 ppm/℃), in particular, TCF = +0.7 ppm/℃ can be obtained in the case of x = 50 vol%. The extrapolated microwave dielectric properties obtained by the fitted infrared reflectivity spectrum are close to the measured data, revealing that the dielectric responses of cold sintered Li 2 MoO 4 -(LiBi) 0.5 MoO 4 ceramics in the microwave range are dominated by the polar optical phonons.